EVOC PPC-1507, Manual

Page: 42 / 81

Appendix
­ 36 ­ PPC­1507
IRQ Assignment Table
There are 15 interrupt sources in the system. Some are occupied by the
system device. Only the ones which are not occupied can be distributed.
The ISA devices claim to engross the interrupt .Only the plug and play
ISA devices can be distributed by the BIOS or the OS. And several PCI
devices can share one interrupt through the distribution of BIOS or OS.
The diagram below shows parts of the interrupt distribution, but it does
not show the interrupts of the PCI devices.
Level Function
IRQ0 System Timer
IRQ1 Standard 101/102 Keyboard or Microsoft Keyboard
IRQ2 Programmable Interrupt Controller
IRQ3 Serial Port #2
IRQ4 Serial Port #1
IRQ5 Intel(R) 82801FBM USB Universal Host Controller ­24C4
IRQ5 ACPI IRQ Holder for PCI IRQ Steering
IRQ6 Reserved
IRQ7 Parallel Port #1
IRQ8 System CMOS/ Real Time Clock
IRQ9 SCI IRQ used by ACPI bus
IRQ1 Intel(R) 82801FBM USB Universal Host Controller­24C2
IRQ1 Intel(R) 82915GM Graphics Controller
IRQ1 ACPI IRQ Holder for PCI IRQ Steering
IRQ11 Realtek AC'97 Audio
IRQ1 PS/2 Compatible Mouse Port
IRQ1 Numeric Data Processor
IRQ1 Intel(R) 82801FBM Ultra ATA Storage Controller­24CB
IRQ1 Slave IDE
For more information, please visit our website:
http://www.evoc.com
.